The new expansion for World of Warcraft, Warlords of Draenor, just released yesterday and so far the login screen looks amazing. I've been trying to log in now for hours on end. All servers currently locked!
I did get into the game this morning at 6am, two hours before the servers were taken down for maintenance. From the time that i've played so far, its awesome, if only the bugs, lag and long queues were fixed.